Hello everybody

In the attached file, I tried to solve the system of equations and obtain the parametric solution for my unknowns that are A1, A2, A3, A4, A5, A6, A7 and A8. I have 8 equations and 8 unknowns. The other variables are all known and parametric. I thought Maple could solve these system of equations easily but when I ran the program and waited for about 2 hours, unfortunately it returned no answer and it was in evaluating mode and I closed the program forcely. Does my file have any problem or Maple cannot solve these system of equations.

Thanks in advance

SOE.mw

Hello

How do I define this function? s(t) = 5*t^1/2

This function shows the pace of a particle. I have to decide the time when the pace of the particle is 2 m/s

help 

Suppose I have a table of variables

f[1]:=a;

f[2]:=b;

numelems(f); gives 2.

In case I have not assign f, 

unassign(f);
numelems(f); gives error message.

Is there any simple way let maple detect that if it is unassined, numelems(f), can provide zero?

Thank you very much

Is there a way to loop over an entire worksheet I already have? I am too lazy to retype everything into one for loop, and I couldn't just copy and paste everything into one command thing (the space you make when you shift-enter). Is there something I can put before my worksheet that runs it, changes one variable, runs it again, etc.?

Thanks! I hope it is clear what I am asking. 

I'm using the bead on a wire worksheet by Peter Stone here http://www.peterstone.name/Maplepgs/numDE2.html the mech2RK worksheet.

I've changed the function to a series expansion of sin for an approximation which gives a more interesting curve.  But I run into a problem when I set the initial conditions D(x)(0)=-5.  If I set D(x)(0)=-4 the bead more or less falls back along the curve but when set as -5 the animation of the bead continues in the wrong direction.

Here is my worksheet.

Download PeterStone-Bead_on_a_wire.mw

I want to make a dot product like

and get the complete result like

but instead I get

Is there a way to force the dot product operation all the way?

 DotProductCommutativity.mw

Hi MaplePrimes,

I want to find the minimum x value for an elipse.  Namely -

x^2 + x*y + y^2 = 2.

I'm sure that the first steps are to differentiate with respect to y and set equal to zero.  This gives

x = -2y.

I'm not sure where to go from there.

Regards,

Matt

Here is a screenshot of my maple worksheet.

I’m trying to use Maple to develop tensor operations using the epsilon-delta notation as used in the attached document, which makes use of the following relationships

permutations.pdf    epsilondelta.pdf

I see how to generate permutations in Maple, and I see there is some mention of what I am trying to do in Maples definition of a signature.  But I am unable to see how to implement it.  Does anyone have any ideas?

Collatz := proc (n)

    local count;

       while n != 1 do

           if `mod`(n, 2) = 0 then n := (1/2)*n

           else n := 3*n+1

           end if;

           count := count+1;

       end do;

print(count);

end proc:

I wanna correct 'illegal use of formal parameter' error.

'n' always goes to 1 through 'while statement'.

though swap can do this,

hope to know a simple way to shift a list or set to the left in cycle in maple

for example

1,2,3

2,3,1

3,1,2

Hello,

I am trying to use Apollonius procedure from geometry package. Here is an example:

restart;
with(geometry): 
circle( c1, [ point( c1c, 0 , 0 ), 5 ] );
circle( c2, [ point( c2c, 5 , 4 ), 2 ] );
circle( c3, [ point( c3c, 13 , 0 ), 3 ] );
A := Apollonius( c1, c2, c3 );

Unfortunatelly the Apollonius method does not give any result. The only message is:

intersection: there is no point of intersection

Anyone know what is wrong in my code?

Best regards

Rafał Nowak

about the help menu of maple2015

I cannot find the help-manual menu at th maple2015

but I can find it at maple18.

how can I use the help-manuals..-List of Packages  from maple2015?

The black point correction for xyY to sRGB was incorrect in my original post. It should be done the same ways as for xyY to aRGB which was correct. Hope nobody was inconvenienced. 

I would be curious if others have found a more elegant way to index through an Array to perform an operation on a set of vectors. I had to use the single quote to get the operation performed first and the index increment second.

Corrections to the original version of theis document;
• Make the scaling for a nonzero black point the same for all RGB color spaces.
• Clip negative RGB values to zero.
• Remove the redundant Array container from matrix multiplications.
Use map in place of the $ to apply a function to each element of an Array.

Pixel_Conversion_B.mw

When I run a simulation (i.e. Double Pendulum Example) MapleSim crashes with no errors or dialogues - completely shuts down. The simulation seems to compile ok, then as the plots are opening it crashes. My video card driver is up to date. Anyone know how to fix this?

Thanks.

Dear Maple users

An engineering student asked me how Maple is handling complex numbers in polar form. He told me that his fellow students are using another CAS, whereas he himself prefer Maple. When making calculations with AC currents having different phases the other students were using the easy notation depicted in the first line on the picture below. Obviously here the angle (argument) is measured in degrees. I tried to perform the same calculations in Maple, but found it to require a very heavy notation: the other three lines on the picture. Now my question is: Does it really have to be that messy, or maybe there are some package, which will accomplish the task in a more neat way? I mean it is a rather common operation in the engineering sciences.

NB! Of couse one can argue about the educational value of using the notation of the other CAS! From that viewpoint they will probably not learn anything ...

Regards,

Erik